SpeedCut narrow kerf cutting systems are more efficient, needing less power from the saw. Ideal for saws up to 55 cc. Low vibration, Micro-Chisel cutters have small radius working corners. LubriTec keeps chain and guide bar oiled for less friction and longer life. Blued cutters deliver protection against corrosion. Expanded top-plate filing indicators and depth gauge filing indicators for accurate sharpening. OCS-01 steel. Always use SpeedCut narrow kerf chain in combination with SpeedCut or Micro-Lite bars.